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Thermal Analysis of the Formation of Chunky Graphite during Solidification of Heavy-section Spheroidal Graphite Iron Parts

Sertucha, Jon and Suarez, Ramon and Asenjo, Iker and Larrañaga, Peio and Lacaze, Jacques and Ferrer, Inaki and Armendariz, Susana Thermal Analysis of the Formation of Chunky Graphite during Solidification of Heavy-section Spheroidal Graphite Iron Parts. (2009) ISIJ International, vol. 49 (n° 2). 220-228 . ISSN 0915-1559

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Official URL: http://dx.doi.org/10.2355/isijinternational.49.220

Abstract

Analysis of cooling curves recorded at the centre of large blocks cast with near-eutectic spheroidal graphite cast irons prone to give chunky graphite has been checked against microstructure observations. It has been observed that solidification proceeds totally at temperatures lower than the stable eutectic temperature and the following solidification sequence could be proposed: 1) nucleation of primary graphite in the liquid; 2) initial eutectic reaction processing by growth of austenite-like dendrites encapsulating the primary nodules; 3) bulk eutectic reaction related to nucleation and then growth of CHG cells and of secondary nodules, these latter giving spheroidal graphite eutectic cells. It was found that the maximum recalescence during the eutectic reaction first increases with the volume of the block affected by chunky graphite, and then decreases when most of the material is affected. Interestingly enough, a relationship between the volume of the blocks affected by CHG and the recalescence measured on TA cups has been observed.

Item Type:Article
Additional Information:Thanks to Japan Science and Technology Information Aggregator, Electronic editor. The definitive version is available at http://www.jstage.jst.go.jp The original PDF of the article can be found at ISIJ International website : http://www.jstage.jst.go.jp/
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > TS Fundiciones SA (SPAIN)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > IK4 - Azterlan - Centro de Investigación Metalúrgica (SPAIN)
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By:Celine Cabaup

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